Since it works with iOS 14 and doesn't with iOS 12 and NR hasn't changed, that points to an iOS bug that was fixed by Apple at some point in time.
If possible I would update the iPhone 7+
Since it works with iOS 14 and doesn't with iOS 12 and NR hasn't changed, that points to an iOS bug that was fixed by Apple at some point in time.
If possible I would update the iPhone 7+